Importance

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Abstract

Indicator apparatus for determining the miss distance of a projectile in relation to a fixed or moving target, comprising pressure-sensing transducers intended to sense the pressure wave generated by the projectile in at least four points, and means for generating corresponding electrical signals therefrom. The apparatus further comprises computer circuits, calculating the distance to the point of origin of the wave, i.e. the so-called 'bang generation point', in response to the characteristics of the pressure wave. This distance has been called the 'miss distance' in previously known indicator apparatus, but in accordance with the invention the miss distance is defined as the shortest distance between the projectile and target, and one object of the invention is to indicate this distance and the exact position of the projectile when it is at the miss distance from the target. In the indicator apparatus in accordance with the invention, the direction of the trajectory is calculated by means of said at least four pressure transducers arranged at the corners of a polyhedron. By measuring the time differences for the passage of the pressure wave past the pressure transducers in the transducer system, the exact position of the bang generation point can be given in relation to the pressure transducer system from these time differences and the measured distance to the point. The indicator apparatus also comprises a second transducer system which can sense either the height of the first pressure transducer system above a horizontal plane, or the passage of the pressure wave at a further instant. From these data the computer circuits can give the trajectory direction which, together with the bang generation point gives the required trajectory. For shooting at fixed targets, the computer circuits give a second point on the trajectory which, together with the bang generation point, gives the trajectory per se.

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First Claim